Shelly Pro 3EM Switch Add-on 2A Dry Contact Relay Module DIN Rail

Shelly Pro 3EM Switch Add-on, Galvanically Isolated 2A Dry Contact Relay for DIN Rail The Shelly Pro 3EM Switch Add-on adds a galvanically isolated relay output to a Shelly Pro 3EM energy meter. It clips onto the side of the meter on the DIN rail, so a single unit can both measure consumption and switch a contactor or other low current load. The potential free contact switches up to 2A at 240V AC or 2A at 30V DC. It is designed for control circuits and light loads rather than direct switching of heavy appliances. A Shelly Pro 3EM is required and is not included. Key Features Add-on module for the Shelly Pro 3EM only, connected through the Shelly proprietary add-on interface. Galvanically isolated, potential free (dry) relay contact with separate input (I) and output (O) terminals. Switches up to 2A at 240V AC or 2A at 30V DC. Powered from the Shelly Pro 3EM at 3.3V and 12V DC, with power consumption below 1W. Internal temperature sensor with temperature reporting. Two red LED indicators: Power (supply connected) and Out (relay contact closed). Slim 19mm wide housing that mounts on a DIN rail alongside the Pro 3EM, with a double mounting bracket supplied. Screw terminals for 0.5 to 2.5mm² solid, stranded or bootlace ferrule conductors. Product Overview The Shelly Pro 3EM measures energy on up to three phases. On its own it reports what is happening; with the Switch Add-on fitted it can also act on that information. The add-on gives the meter a relay output that can be controlled locally or through automations, for example energising a contactor when consumption, export or another condition is met. The add-on replaces the mounting bracket on one side of the Pro 3EM and plugs into the meter's header connector. Both devices then sit on the DIN rail as one assembly, held by the supplied double bracket. The add-on takes its power from the Pro 3EM, so no separate supply is needed. Because the contact is isolated from the meter electronics, it can switch either an AC circuit up to 240V or a DC control circuit up to 30V. The manufacturer lists resistive, capacitive and inductive loads as supported, including contactors, transformers and fans, with an RC snubber shown in the wiring guidance for inductive loads. With a 2A limit, larger loads should be switched through a correctly rated contactor driven by the add-on. Applications Driving a contactor from a Shelly Pro 3EM based on measured consumption or export Switching small resistive loads such as indicator lamps or small heating elements Low voltage DC control signals up to 30V, such as an inverter or controller enable input Residential consumer units and multi dwelling buildings Light commercial, agricultural and industrial energy monitoring and control panels What Is Included 1 x Shelly Pro 3EM Switch Add-on 1 x Double DIN rail mounting bracket 1 x Printed user and safety guide Installation and Safety Notes Compatibility: this add-on works only with the Shelly Pro 3EM, which is sold separately. It does not work as a standalone switch. Installation must be carried out by a qualified electrician in line with BS 7671 (IET Wiring Regulations). Isolate the supply and confirm with a voltage tester or multimeter that there is no voltage on the Pro 3EM terminals before fitting the add-on or changing any connection. Take care not to bend the header pins when joining the add-on to the meter. Connect the load circuit to the O terminal and the neutral, and connect the I terminal to a suitably rated circuit breaker. A neutral conductor is needed for the switched load circuit. Never exceed 2A at 240V AC or 2A at 30V DC; use a contactor for anything larger. Solid single core conductors are recommended, stripped 6 to 7mm, with terminal screws tightened to no more than 0.4Nm. The add-on has no published IP rating and must not be installed anywhere it can get wet. Fit it only inside a dry indoor consumer unit or enclosure, within an ambient temperature of minus 20°C to 40°C and 30% to 70% relative humidity. High voltage is present on the add-on interface when the device is powered.